Experimental Investigation of the Hyperfine Structure of Tm I with Fourier Transform Spectroscopy, Part A: in the visible wavelength range 400 nm 700 nm

TL;DR

This study uses Fourier Transform Spectroscopy to analyze the hyperfine structure of neutral thulium (Tm I) in the visible range, determining hyperfine constants for multiple energy levels for the first time.

Contribution

First-time determination of magnetic dipole hyperfine structure constants for 20 levels of Tm I using Fourier Transform Spectroscopy.

Findings

Hyperfine structure constants for 20 Tm I levels determined

Spectra recorded in 400-700 nm range using Fourier Transform Spectroscopy

Hyperfine-structure splitting analyzed for 50 spectral lines

Abstract

The spectra emitted by a thulium hollow-cathode discharge lamp with argon or neon as inert gases have been recorded with a Bruker IFS 125 HR Fourier Transform spectrometer in the visible wavelength region from 400 nm to 700 nm. The paper presents the investigation of the hyperfine-structure splitting of 50 spectral lines of neutral thulium. As a result, the magnetic dipole hyperfine structure constant A for 20 fine structure levels of Tm I have been determined for the first time.